Conventional Open Cut

  • Home
  • Conventional Open Cut
Project Large Image

Summary

    The Conventional Open Cut method is a traditional approach to underground construction where a trench or excavation is dug from the surface down to the required depth, the underground structure is built within this excavation, and then the area is backfilled.

    The Conventional Open Cut method remains widely used for utility installations, shallow foundations, and other underground structures where surface disruption is acceptable and depths are moderate.

  • Creates a temporary open excavation from the ground surface
  • Requires extensive surface disruption
  • Typically used for shallow structures (sewers, utility lines, foundation work)
  • Generally the most economical option when conditions permit
  • No specialized tunneling equipment required

Construction Process

  • Site Preparation: Clear the construction area and implement traffic management if necessary.
  • Support Systems Installation: Set up shoring, sheet piling, soldier piles, or slurry walls to prevent cave-ins for deeper excavations.
  • Excavation: Remove soil to create the open trench to the required depth and width.
  • Dewatering: Pump out groundwater if necessary to keep the excavation dry
  • Underground Construction: Build the underground structure within the open excavation
  • Backfilling: Replace the excavated soil around and above the completed structure
  • Surface Restoration: Restore the surface to its original condition or as required

    • Advantages

  • Simple construction methodology with conventional equipment.
  • Direct visual access during construction.
  • Lower cost for shallow depths compared to tunneling methods.
  • Well-suited for structures with large cross-sections.
  • Greater flexibility for handling unexpected ground conditions.

    • Limitations

  • Significant surface disruption and traffic impact.
  • Challenging in densely developed urban areas.
  • Not practical for deep structures.
  • Can be expensive where extensive support systems are needed.
  • Environmental impacts can be significant (noise, dust, vibration).
  • Groundwater issues can be challenging.